TOI-677b: A Warm Jupiter (P = 11.2 days) on an Eccentric Orbit Transiting a Late F-type Star

We report the discovery of TOI-677 b, first identified as a candidate in light curves obtained within Sectors 9 and 10 of the Transiting Exoplanet Survey Satellite (TESS) mission and confirmed with radial velocities. TOI-677 b has a mass of ${\text{}}{M}_{{\text{}}p} = ${1.236}_{-0.067}^{+0.069} ${\text{}}{M}_{{\rm{J}}}, a radius of ${\text{}}{R}_{{\text{}}P} = $1.170\pm 0.03 ${\text{}}{R}_{{\rm{J}}}, and orbits its bright host star (V = 9.8 mag) with an orbital period of $11.23660\pm 0.00011 d, on an eccentric orbit with $e=0.435\pm 0.024 . The host star has a mass of ${\text{}}{M}_{\star } = $1.181\pm 0.058 ${\text{}}{M}_{\odot }, a radius of ${\text{}}{R}_{\star } = ${1.28}_{-0.03}^{+0.03} ${\text{}}{R}_{\odot }, an age of ${2.92}_{-0.73}^{+0.80} Gyr and solar metallicity, properties consistent with a main-sequence late-F star with ${T}_{\mathrm{eff}}=6295\pm 77 K. We find evidence in the radial velocity measurements of a secondary long-term signal, which could be due to an outer companion. The TOI-677 b system is a well-suited target for Rossiter-Mclaughlin observations that can constrain migration mechanisms of close-in giant planets.